Biological molecules

1

100

You can detect the presence of starch using

iodine solution.

200

This changes from ______ to _______

if starch is present

Brown , blue-black

300

Cellulose molecules are also made of many glucose molecules linked in a chain

How are the different to starch?

Straight line vs spiral coil

2

100

Reducing sugar can be detected with

Benedicts solution

200

Benedicts is normally _____ but becomes ______ when heated with reducing sugars

blue,  orange-red

300

What is a dependent variable?

The variable you measure in your experiment 

e.g. (time in diffusion experiment)

3

100

What is an independent variable?

The variable you change in an experiment 

e.g. (The surface area of the surface of diffusion)

200

How do I test for fats and oils?

Ethanol Emulsion test

300

The Ethanol Emulsion test involves dissolving _____
in _____ and then mixing it with ______.

If there are ____ in the ____ they form tiny _____ in the _____ which creates a _____ colour

fats, ethanol, water

fats, ethanol, droplets

water, milky white

4

100

To test for proteins we use _____

biurets reagent

200

Biurets reagent starts ____- and turns _____ when in contact with proteins

blue, violet

300

To test for the presence of vitamin C we use

_______

It changes colour from ______ to ______ in the presence of vitamin C

DCPIP

purple, clear